28-21-71
 ALL  ú ú 01 Page 406 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (f)  
Make loops in the wire to make the wire and the float switch easy to move.

 (g)  
Remove the float switch from the fuel tank.

 (h)  
When it is necessary to remove the conduit for the fueling float switch in the wing tank, do the steps that follow:

 (i)  
From out of the wing tank remove the bulkhead union nut.

 NOTE: Make sure the conduit is held from in the tank while
____ the bulkhead union nut is removed. This is to prevent the conduit and union from falling in the tank.
 1) Remove the washer.
 2) From in the wing tank, remove the conduit nut at the

 bulkhead union. 3) Remove the bulkhead union. 4) Remove the bulkhead union O-ring.
 TASK 28-21-71-404-013
 3. Float Switch Installation
_________________________
 A. Equipment
 (1)  
Puller - wire, to pull wires through the electrical conduit

 (2)  
Ohmmeter - to measure electrical continuity

 (3)  
Splices - moistureproof, to connect wires

 (4)  
Syringe - small, to remove fluid from the float switch conduit

 (5)  
Equipment to fill the conduit with grease:

 NOTE: This equipment, including the necessary grease
____ (MIL-G-27617, Type I) is available as a kit from Castrol Inc., 16715 Von Karman Ave., Suite 230, Irvine, CA, 92714.
 (a)  Tube - plastic, maximum outer diameter 0.25 inches, approximately 24 inches long
 (6) Gun - dispensing, to put grease into the tube, available from Andpak-EMA, Inc., 1860 Dobbin Drive, San Jose, CA 95133.
 B. Consumable Materials
 (1)  D00173 Grease, MIL-G-27617, Type I, Type II, Type III, or Type IV
 C. References
 (1)  
AMM 27-81-00/201, Leading Edge Flaps

 (2)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (3)  
AMM 28-11-31/401, Center Tank Access Panel

 (4)  
AMM 28-21-00/501, Pressure Fueling

 (5)  
SWPM 20-30-12

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-21-71
 ALL  ú ú 01 Page 407 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 D. Access
 (1)  
Location Zone
 305 Left Fuel Tank
 405 Right Fuel Tank
 303 Left Inboard Leading Edge
 403 Right Inboard Leading Edge
 221 Center Section Fuel Tank
 302 Left Outboard Leading Edge
 402 Right Outboard Leading Edge

 (2)  
Access Panels
 6540 Refueling Station Access Door
 7213 Fuel Tank Access Door
 7413 Fuel Tank Access Door
 6223 Slat Access Panel (Left)
 6523 Slat Access Panel (Right)

 E. Procedure
 S 434-014
 (1)  Attach the washers and the mounting nut to the float switch.
 (a)  
Put the wires on the float switch through the washers and the mounting nut.

 (b)  
Install the washers and the mounting nut loosely on the float switch.

 S 424-015
 (2)  
Put the switch in its correct position in the fuel tank.

 S 434-033

 (3)  
If the conduit of the fueling float switch found in the wing tank is removed, do the steps that follow:

 (a)  
Put a new O-ring on the bulkhead union.

 (b)  
From in the wing tank, put the bulkhead union through the wing front spar.

 (c)  
Make sure the bulkhead union aligns with the union retainer fitting.

 (d)  
From out of the wing tank, install the washer on the bulkhead union.

 NOTE: Make sure the bulkhead union is held from in the
____ wing tank while the bulkhead union washer is installed. This is to prevent the union from falling in the wing tank.
 (e)  
Install the bulkhead union nut.

 (f)  
From in the wing tank, loosely install the conduit nut on the bulkhead union.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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